Seed capsules of the Shepherd’s purse are either triangular or ovoid. A cross between a plant with triangular seed capsules and a plant with ovoid seed capsules yielded F₁ hybrids that all had triangular seed capsules. When these F₁ hybrids were inter crossed, they produced 80 F₂ plants, 72 of which had triangular seed capsules and 8 of which had ovoid seed capsules. Are these results consistent with the hypothesis that capsule shape is determined by a single gene with two alleles?